A URL is the address of a website on the World Wide Web. URL stands for Uniform Resource Locator. To visit a website you type the URL into a browser. Other internet resourses have URLs too, but if the URL starts with http:// then you know it is on the World Wide Web.
For example the URL for this wiki is http://templesictwiki.wikispaces.com
For example the URL for this wiki is http://templesictwiki.wikispaces.com